JPH0451769A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To avoid repetition of waste use of a communication network and repetition of redialing by providing a means informing a line interrupt cause to an opposite terminal equipment due to a facsimile information field added to a line interrupt instruction signal to the facsimile equipment. CONSTITUTION:A reception terminal equipment (station B) sends a line interrupt instruction signals (DCN) to a transmission terminal equipment (station A) when the result of password collation shows noncoincidence, a field FIF being a facsimile information field is added to the sent DCN to inform the state (password noncoincidence) of the station B resulting from the DCN transmission thereby allowing the station B to reject the reception. The station A receiving the DCN with the FIF analyzes the FIF and the communication is terminated without useless redialing. Thus, the terminal equipment receiving the DCN displays and outputs the state of the opposite terminal equipment and a waste or useless redialing or repetition of inquiry by the operator is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a facsimile device, and particularly to a facsimile device that opens a communication network due to a communication abnormality.

[Conventional technology]

Conventionally, this type of facsimile machine transmits a line disconnection command signal (hereinafter referred to as DCN) when it becomes unable to continue transmitting or receiving operations due to a communication error in its own terminal, etc., and then disconnects from the communication network. By opening it, communication operations were unilaterally interrupted. FIG. 3 is a communication sequence diagram showing an example of a communication procedure of a conventional facsimile machine.

Here, the procedure signal is in accordance with International Telegraph and Telephone Advisory Committee Recommendation T30. When a transmitting terminal (hereinafter referred to as A station) dials a receiving terminal (hereinafter referred to as B station), the B station receives a ringing signal and automatically responds, and then receives a called station identification signal (hereinafter referred to as CED). Non-standard equipment signal (hereinafter referred to as NSF) which is the initial identification signal and digital identification signal (
The station A side receives this and sends a non-standard setting signal (hereinafter referred to as NSS) and a training check signal (hereinafter referred to as TCP) to station B. Here, NSS is an optional signal for identifying a request from a specific user, and the password on the A station side is indicated by a specific pattern of the NSS frame. When station B receives this, it checks it against the pre-registered password on station B's side, and if it matches, it will exchange image signals according to the 730 procedure, but if the password comparison result does not match, it will issue a line disconnection command. A certain DCN is sent and reception is rejected. However, on the A side that received the DCN, D
Unable to grasp the status of station B that led to CN transmission,
Since it is not possible to determine whether it is impossible to continue transmitting or receiving operations due to a parameter mismatch, or whether it is due to an unforeseen accident, communication is attempted again using the recall operation, but the line is disconnected at the DCN as before. It ended without any communication.

[Problem to be solved by the invention]

In the above-mentioned conventional facsimile device, since the terminal receiving the DCN cannot accurately grasp the status of the other party's terminal, it attempts to communicate with the other party's terminal again through a re-calling operation, but is unable to communicate. This method not only uses the communication network unnecessarily, but also has the disadvantage that the facsimile machine is occupied during repeated call operations.

[Means to solve the problem]

The facsimile apparatus of the present invention includes a transmission control section that controls communication procedures, a modulation/demodulation section that modulates and demodulates the procedure signals to be transmitted and received, a communication network control section that controls calls to and from the communication network, and a terminal control section that collectively controls each of the above sections. The facsimile apparatus includes means for notifying the other party's terminal of the cause of the line disconnection using a facsimile information field added to the line disconnection command signal sent in accordance with the communication procedure.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention.

In FIG. 1, two similar sets of facsimile machines with automatic call/receive functions are connected via a communication network 5. In FIG. Each facsimile machine is configured to include communication network control sections IA, IB, modulation/demodulation sections 2A, 2B, transmission control sections 3A, 3B, and terminal control sections 4A, 4B.

Next, to explain the incoming call operation procedure, the terminal control unit 4
A communication network control unit A is notified of the dial number of the other station and automatically dials the other station.

Next, the incoming call operation procedure will be explained. The communication network control unit IB detects a calling signal from the communication network 5, and notifies the terminal control unit 4B of the incoming call.

Next, explaining the transmission of the procedure signal, the procedure signal received from the communication network 5 through the communication network control section IB is notified to the terminal control section 4B8' through the modulation/demodulation section 2B.
FIG. 2 is a communication diagram showing the communication procedure when the passwords do not match when the receiving terminal verifies the passwords. As in the conventional case, when you dial from station A to station B, station B receives a paging signal and automatically answers,
Return ED, NSF, and DIS to station A, and A receives this.
On the station side, NSS and TCP are returned to station B, and password verification is performed on the station B side. If the passwords do not match as a result of the password verification, a DCN is sent to station A, but the DCN sent at this time is
Add PIF, which is a facsimile information field, to
Status of station B side that led to DCN transmission (password mismatch)
・Reject the reception. Station A, which has received the DCN with PIF, analyzes the PIF and terminates the communication without performing any unnecessary re-call operations.

Note that when the communication ends, the A station side can also give a warning to the operator or leave the communication results in a report or the like.

In addition, although this embodiment shows the case of password verification at the receiving terminal, in any situation, the DCN
By adding , it is possible to perform the same operation as in the above embodiment.

〔Effect of the invention〕

As explained above, the present invention notifies the partner terminal of the cause of opening the communication network in the facsimile information field added to the line disconnection command signal, and the terminal that receives the line disconnection command signal displays the status of the partner terminal. This has the effect of eliminating unnecessary re-call operations or repeated inquiries by the operator.

Kushimiri information field.

Claims (1)

[Scope of Claims] 1. A transmission control unit that controls communication procedures, a modulation/demodulation unit that modulates and demodulates procedure signals to be transmitted and received, a communication network control unit that controls calls to and from the communication network, and a terminal control unit that collectively controls each of the above units. 1. A facsimile apparatus comprising means for notifying a partner terminal of the cause of line disconnection by means of a facsimile information field added to a line disconnection command signal sent in accordance with the communication procedure. 2. The facsimile apparatus according to claim 1, wherein the facsimile apparatus outputs and displays the line disconnection factor received and identified from the communication network.